Screen Share Lock
There needs to be a way that IT or the teacher can assign a password and not a pin that is on the board for students to see, that will lock the boards screen share to that teacher only. This will stop the issue of any student or teachers just clicking any device under their cast feature on their browser and broadcasting to the board. I deal with this multiple times daily that a student or teacher has taken over a board that is not in the room they are in.

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Brian Klug commented
We have discovered that students have found out how to turn off the Pin needed and authorization needed to cast to the boards in the settings on the board. Since they can turn this off they can randomly cast to the boards with their phones and display whatever they like. There is also no way to lock the settings that we have found to keep them from doing this.
I have also learned that the Smart Remote Management can't control the screen share access. This has turned into a huge liability that we can't control.